[alsa-devel] [PATCH - Fix Fast Track Ultra series: 44.1/88.1 kHz 1/Fix playback/capture issues and related chrashes at 44100 Hz and 88200 Hz for M-Audio Fast Track Ultra series.

[Clemens Ladisch]

Felix Homann wrote:
> This fixes issues with M-Audio's Fast Track Ultra series:
> 
> * devices now work at 44100 and 88200 Hz

The descriptors already list these rates, so in theory, the existing
code that sets UAC_EP_CS_ATTR_SAMPLE_RATE should already have enabled
this.  Didn't it?  In other words, what is the difference in the
explicitly specified audioformat?

(I have the suspicion that we don't actually need a AUDIO_FIXED_ENDPOINT
quirk for these devices.)

> * apparently, fixes some crashes, too

When do these crashes happen?

> This is based on a patch posted by user 'dhubsith' on the M-Audio user 
> forum.

If you don't have the exclusive copyright for the code in this patch,
there needs to be a Signed-off-by line from him, too.  OTOH, a table
like this probably isn't copyrightable at all.

> -	USB_DEVICE(0x0763, 0x2080),
> +		USB_DEVICE(0x0763, 0x2081),
> ...

This replaces the ID of the Ultra 8 ID with that of the Ultra 8R ...

>  	USB_DEVICE(0x0763, 0x2081),
> -	.driver_info = ...
> +		.driver_info = ...

... and this just changes the other 8R entry.  So now the 8 doesn't
have an entry.


Regards,
Clemens